Multistage hot-water centrifugal pump



s. WEY LAND MULTI STAGE HOT WATER CENTRIFUGAL PUMP Filed Sept. 7, 1929 June 24, 1930.

Patented June :24, 19 30 tum'rso STATES PATENT; oar-ice (mono mam, or raamfmnrnu, GERMANY IULTISTAGE'HOT-WA'TER CENTRIIUGAL PIIMP I Application'fled September 7, 1929, Serial Il'o. 391,011, and in Germany September 15,1928.

, This invention relates to a multi-stage hot-water centrifugal pump, .and the primary object thereof is to eliminate the difiicultics which arise in connection with the packing of the stufling box on the hi h pressure side due to the vfact that the stu g box cannot be maintained as a tight joint at the high pressures and temperatures occurring.

On the other hand the stufling box packing m on the highpressure side is capable of fulits ob ect if hot water is prevented from reaching the stufiing box.

This in the case of the invention may be most readily accomplished by taking as a basis a' multistage hot-water centrifugal.

pump, which pre-heats the liquid between two pressure stages, and in whlch a seahng liquid chamber is ac chamber. The passage of the hot water to the stufiing box may then be prevented by the fact that in the said .sealing liquid chum her a higher pressure and lower temperature is maintained than prevails in the leakage :5 water chamber. In this manner the stufling box is insulated against passage of the water by relief of the pressure.

According to one form of embodimentof the invention the sealingiiquid chamber and so the leakage water cham r are connected .to

the same pressure stage, viz., the sealing liquid' 'chamber at the outlet socket for the liquid which is not pre-heated, and the leakage water chamber on the other hand at the :5 inlet socket for the pre-heated liquid. In

this manner it isaccomplished that the dropv socket A in the first stage (Fig.2), and

provided between the stufling box and the so-called leakage water;

my f, It will be understood that no restriction is tation of thepump with the pre-heater.

In the example according to the drawing the pump is assumed to be one having eight pressure stages, and. wherein the second stage is in connection" with the pre-heater," so that the pre-heated water is introduced in the third stage and the further stages raise the pre-heated water to boiler pressure.

The cold water enters through the. inlet' passes" through the .outlet socket B of the -secondstage into the pre-heater vV, from which the pre-heated water is conducted into the inlet socket C of the third stage. From the outlet socket D of the ei hth stage the hot water is conducted under igh pres-v sure to the boiler. E is the stufling box, which is to be protected against the entry of hot water from the so-called leakage water chamber F. Between the two parts E and F is situated the sealing liquid chamber G. According to the invention the stufling box E is protected against the passage of hot water'by the fact that in the sealing liquid chamber G- a higher pressure and a lower temperature are maintalned than in the leakage water cham- .ber F. The hi her pressure prevailing in the sealing liquid chamber G and also the lower temperature then protect the stufling box E against the cut of hot water from the leakage water cham r F. For this urpose the sealing liquid chamber G and the' leakage water chamber F are connected to the same pressure stage. Practically the same pressure prevails in the socket B, which conducts'the cold feed water to the pre-heater V, and the socket C, which passes the preheated feed water to the'third pressure stage. i

Accordingly, the most simple construction consists in connectin the sealing liquid p'pe H, and the leakage water chamber F to the socket C by means of a' pipe I.

made to the particular formof embodiment illustrated in the drawing, and that'various;

modifications may be madewithin the mean,' ing of-thej. above description andj'the ap chamber G to the soc et B by means of a I tages of t e pump, a leakage pended claims without departing from the spirit of the invention.

What I claim-as new and desire by Letters Patent is:

a pre-heater'for pre-heating the delivery 1i uid between two of the water 0 amber, a stufling box, and means or preventing access of hot water to the said stufling box by maintaining at a point between the said stufling box and the said leakage water chamber a higher pressure and a lower temperature than prevails in the said leakage water chamber.

2. In a multi-stage hot-water centrifugal pump, a pre-heater for pre-heating the delivery liquid between two of the pressure stages of thepump', a leakage water chamher, a stufling box, and a sealingmliquid hamber between the said stufling x and the said leakage water chamber for preventing access of, t water to the said stufling box by maintaining in the said sealing liquid 7 stages of the pump,

' li uid chamber to the outlet socket the leakage water 0 chamber a higher pressure and a lower temperature )than prevails in the said leakage water chamber.

3. In a multi-stage hotwater centrifugal a pre-heater for pre-heating the eliquid between two of the pressure a leakage water chamber, a stufiing box, and a sea liquid chamber between the. saidstufling x and the said leakage water chamber, and means pump, livery establishing connections between the said leakage water chamber and the said sealing liquid chamber, respectively,'and the same pressure stage of the pump, viz., the sealing for the de iv'ery liquid which is not pre-heated and hamber to the inlet socket for the pre-heated delivery liquid, whereb the drop in "pressure resulting by the resistance of the elivery liquid in the said pre-heater is utilized for producing differences in pressure and temperature in the said sealing liquid and leakage water containers.

Intestimony whereofll aflixm si ature.

GEORG WE 1. In a multi-stage hot-water centrifugal plressure 

